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A Rapid In Situ Colorimetric Assay for Cobalt Detection by the Naked Eye

A Rapid In Situ Colorimetric Assay for Cobalt Detection by the Naked Eye

Sung-Min Kang, Sung-Chan Jang, Gi Yong Kim, Chang-Soo Lee, Yun Suk Huh, Changhyun Roh

Sensors (Basel). 2016 May 2;16(5):626.

PMID: 27144568

Abstract:

A simple, rapid, and convenient colorimetric chemosensor of a specific target toward the end user is still required for on-site detection and real-time monitoring applications. In this study, we developed a rapid in situ colorimetric assay for cobalt detection using the naked eye. Interestingly, a yellow to light orange visual color transition was observed within 3 s when a Chrysoidine G (CG) chemosensor was exposed to cobalt. Surprisingly, the CG chemosensor had great selectivity toward cobalt without any interference of other metal ions. Under optimized conditions, a lower detection limit of 0.1 ppm via a spectrophotometer and a visual detection limit of 2 ppm with a linear range from 0.4 to 1 ppm (R² = 0.97) were determined. Moreover, the CG chemosensor is reversible and maintains its functionality after treatment with chelating agents. In conclusion, we show the superior capabilities of the CG chemosensor, which has the potential to provide extremely facile handling, high sensitivity, and a fast response time for applications of on-site detection to real-time cobalt monitoring for the general public.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP532821	Chrysoidine G		532-82-1	Price

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